Breech block



Jan. 1, 1963 J. KAPITULA BREECH BLOCK Filed Sept. 13, 1957 INYENTOR a BY I I 3" tent "hire 3,071,044 EREECH BLOCK John Kapitula, 143 Van Horne St, Jersey City, NJ. Filed Sept. 13, 1957, Ser. No. 683,801 1 Claim. ((Zl. 89-417) This invention relates to breech blocks for guns, and one of its objects is to so form the breech block that a faster recoil of the gun is effected, with a resulting increase in the speed of the projectile. The invention may be used with or without the cavitized form of projectile shown in my pending application, Serial No. 604,521 and entitled Projectile.

The drawings illustrate the invention, and in these:

FIG. 1 is a side elevation of a breech block of this invention;

FIG. 2 is an end view of FIG. 1;

FIG.'3 is a longitudinal section taken on line 3-3 of FIG. 2; and

FIG. 4 shows a modified form of the invention.

Referring to the drawings for a description thereof, and at first to FiGS. 1 and 2, the breech block 5 is shown as having interrupted buttress type external threads 6 to lock the block in the gun, as known. The block is mounted to the gun in any usual or preferred manner, the right end of the block in FIG. 1 being the inner end, the left end usually hinged to the gun.

The breech block of FIGS. 1 and 2 has a cavity formed therein, to receive the gases of explosion, and extending from the inner end of the block towards the rear, being symmetrical with respect to the longitudinal axis. The form of the cavity is described as follows:

At the inner end portion of the block, the cavity is funnel-shaped, to direct gases into a constricted or venturi section 8. Inwardly of the latter section, the cavity expands into section 9, which is in the form of a double cone. The inner portion of section g diminshes to a constricted end section 10, which terminates at a point 11. To facilitate the formation of the described cavity, the block is made in two sections, 5a and 5b, threadedly connected at 16.

The provision of the cavity described collects at a high pressure some of the exploding gases, which results in a faster recoil of the gun and a higher and more prolonged pressure on the projectile, especially when using a 5 cavitized projectile of the type shown in my pending application above identified.

Referring now to FIG. 4, I show a block with a modified form of cavity, which has advantages similar to the form previously described. The modified cavity is fun- 10 nel-shaped, comprising a conical section 118 at the inner end of the block and a tubular portion 19, which terminates at a point 20. This form of cavity may be made in a one-piece breech block, although shown in a twopiece block.

When the breech block is used in combination with the projectile shown in the above identified application, the described effect is enhanced due to what I call a pointto-point or line action of the pressure.

What is claimed is:

A breech block for guns, said block having an internal cavity extending readwardly from its inner end and open to receive gases resulting from the explosion which ejects a projectile, and having a volume large enough to provide a useful result from the gases received therein, the

5 cavity comprising a conical section at its inner end, the

diameter of said section at said inner end being approximately that of the bloclc, said cavity being constricted immediately behind the conical section, the cavity expanding conoidally from the constricted section and then diminishing conoidally to a blind end.

References Cited in the file of this patent UNITED STATES PATENTS I Seabury Sept. 27, 1892 

